That left them three points adrift of sixth-placed Ipswich and needing four points from their final two away matches to qualify for the end of season play-offs – and a quarter-final tie against Glasgow .
It was another strong all-round performance by the Devils with six of the side being paid for double figure scores.
Scunthorpe were forced to make a late change with skipper Theo Pijper ruled out through injury and his replacement, National League rider Sam Darroch, failed to score from three starts.
Plymouth co-promoter Ashley Taylor admitted: “It was an easy meeting for our guys. But winning meetings builds confidence and that was a useful exercise in building a winning mentality.”
Plymouth: Ryan Fisher 10+2 (5 rides), Morten Risager 13+1 (5), Jack Holder 10+1 (4), Todd Kurtz 8+2 (4), Kyle Newman 10+2 (4). Reserves: Sam Simota 10 (4), Linus Eklof 1 (4)
Scunthorpe: Rider replacement for Zdenek Holub, Sam Darroch 0 (3), Andreas Lyager 3 (6), Carl Wilkinson 4 (5), Leigh Lanham 11 (6). Reserves: Alex Davies 10+1 (6), Nike Lunna 2+1 (4).
PLYMOUTH round off their league season with away matches against Scunthorpe on Friday and Rye House on Saturday.
Todd Kurtz is a doubtful starter for the visit to Scunthorpe after injuring his left knee in a crash with Alex Davies on Thursday evening. The Devils will operate rider replacement if Kurtz is unfit.
Meanwhile, Scunthorpe have called up Sheffield riders Andre Compton and David Bellego as guests for Pijper and the unavailable Andreas Lyager.
Scunthorpe: Rider replacement for Zdenek Holub, Andre Compton, David Bellego, Carl Wilkinson, Leigh Lanham. Reserves: Alex Davies, Nike Lunna.
Plymouth: Ryan Fisher, Morten Risager, Jack Holder, Todd Kurtz, Kyle Newman. Reserves: Sam Simota, Linus Eklof